94 lines
2.4 KiB
Python
94 lines
2.4 KiB
Python
# https://pypi.org/project/music-helper/
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import warnings
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import re
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import hashlib
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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from attrs import define
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from .track_formats import TrackFormat
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def clean_query(query):
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query = re.sub(r"/ feat[.]? /g", " ", query)
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query = re.sub(r"/ ft[.]? /g", " ", query)
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query = re.sub(r"/\(feat[.]? /g", " ", query)
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query = re.sub(r"/\(ft[.]? /g", " ", query)
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query = re.sub(r"/&/g", "", query)
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query = re.sub(r"/–/g", "-", query)
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query = re.sub(r"/–/g", "-", query)
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return query
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def get_text_md5(text, encoding="UTF-8"):
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return hashlib.md5(str(text).encode(encoding)).hexdigest()
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@define
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class UrlDecrypter:
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md5_origin: str
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track_id: str
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media_version: str
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def get_url_for(self, track_format: TrackFormat):
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step1 = (
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f"{self.md5_origin}¤{track_format.code}¤"
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f"{self.track_id}¤{self.media_version}"
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)
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m = hashlib.md5()
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m.update(bytes([ord(x) for x in step1]))
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step2 = f"{m.hexdigest()}¤{step1}¤"
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step2 = step2.ljust(80, " ")
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cipher = Cipher(
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algorithm=algorithms.AES(key=bytes("jo6aey6haid2Teih", "ascii")),
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mode=modes.ECB(),
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backend=default_backend(),
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)
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encryptor = cipher.encryptor()
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step3 = encryptor.update(bytes([ord(x) for x in step2])).hex()
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cdn = self.md5_origin[0]
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return f"https://e-cdns-proxy-{cdn}.dzcdn.net/mobile/1/{step3}"
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@define
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class ChunkDecrypter:
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cipher: Cipher
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@classmethod
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def from_track_id(cls, track_id: str):
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with warnings.catch_warnings():
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warnings.filterwarnings("ignore")
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cipher = Cipher(
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algorithms.Blowfish(get_blowfish_key(track_id)),
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modes.CBC(bytes([i for i in range(8)])),
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default_backend(),
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)
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return cls(cipher=cipher)
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def decrypt_chunk(self, chunk: bytes):
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decryptor = self.cipher.decryptor()
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return decryptor.update(chunk) + decryptor.finalize()
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def get_blowfish_key(track_id: str):
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secret = "g4el58wc0zvf9na1"
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m = hashlib.md5()
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m.update(bytes([ord(x) for x in track_id]))
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id_md5 = m.hexdigest()
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blowfish_key = bytes(
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[(ord(id_md5[i]) ^ ord(id_md5[i + 16]) ^ ord(secret[i])) for i in range(16)]
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)
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return blowfish_key
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